Abstract
The interactions of oxygen with a Ru(001) surface were investigated at 300–1300 K by AES, thermal desorption spectroscopy (TDS) and work function measurements. A single second-order TD peak was observed at coverages θ lower than 0.25. The considerable changes in the shapes of the TD curves recorded at θ < 0.25 suggested a multistate oxygen desorption. It was demonstrated that oxygen diffusion into the Ru lattice, which began at T ⩾ 1150 K, substantially affected the TD data. It was found that oxygen bulk diffusion was much more probable for the binding state existing at θ < 0.25 than for those appearing in the θ range between 0.25 and 0.5.
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